Self-resonance tuning piezoelectric energy harvester with broadband operation frequency

Abstract

Provided is a self-resonance tuning piezoelectric energy harvester. The self-resonance tuning piezoelectric energy harvester includes a piezoelectric beam which extends along a horizontal direction, a fixing element which fixes two ends of the piezoelectric beam, and a mass which is connected to the piezoelectric beam movably along the piezoelectric beam, wherein the mass includes a through-hole through which the piezoelectric beam passes, and makes the movement through the through-hole. According to the principle of continuous movement to the resonance position, the mass of the self-resonance tuning piezoelectric energy harvester induces the piezoelectric beam to generate displacement to the maximum and maximize the electricity production capacity of the piezoelectric energy harvester.

Description

DESCRIPTION OF GOVERNMENT-SPONSORED RESEARCH AND DEVELOPMENT[0001]This research is made in line with the industrial technology innovation project (energy technology development project) “research of energy harvesting material and model development for independent power of smart sensor” (project serial number: 20182010106361) in Ministry of Trade, Industry and Energy under the supervision of Korea Institute of Energy Technology Evaluation and Planning.[0002]This research is made in line with the creative fusion research project “research of piezoelectric / electrostatic / electrochemical hybrid energy harvesting material and device development” (project serial number: CAP-17-04-KRISS) in Ministry of Science and ICT under the supervision of National Research Council of Science & Technology.CROSS-REFERENCE TO RELATED APPLICATION[0003]This application claims priority to Korean Patent Application No. 10-2018-0101978, filed on Aug. 29, 2018, and all the benefits accruing therefrom under 35 U....

AI Technical Summary

Benefits of technology

[0008]The present disclosure is designed to solve the problems such as those described above, and therefore the present disclosure is directed to providing a self-resonance tuning piezoelectric energy harvester in which when the changing external vibration is applied, a mobile mass moves by itself to a position of a piezoelectric beam at which resonance occurs. Because the mobile mass moves by itself to the position of the piezoelectric beam at which resonance occurs, the present disclosure has a wide operation frequency bandwidth, and may continuously maintain resonance and maximize the piezoelectric output efficiency without additional supply.

[0016]The piezoelectric energy harvester according to an embodiment of the present disclosure has a simple structure because it includes a piezoelectric beam and a mass, and the mass may move to and be fixed to a position on the piezoelectric beam at which resonance occurs in response to external vibration. Accordingly, the piezoelectric beam of the present disclosure may efficiently produce electrical energy in a wide frequency range while minimizing a user's interference.

Problems solved by technology

However, when the resonance frequency is outside of the fixed natural frequency of the device, displacement significantly reduces and piezoelectric output significantly reduces.

Accordingly, a method that changes the natural frequency using the nonlinear resonant characteristics of a structure, or by adjusting the size of an actuator or a structure has been used, but displacement significantly reduces in frequency ranges other than the resonance frequency and additional external supply is necessary, so it is not efficient in terms of energy.

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